Help!

[Red Devil Turbo]

I tried to run my Nistune ECU, it did not worked, I put back the stock one, it started I drove it, park it and the next day tried to start it again and it does not start. I hear the starter cranking the engine but does not start. HELP PLEASE...

[Red Devil Turbo]

what about the black grounding cable going to the ECU, when I remove it to remove the ECU is sparked like it had a connection, but now does not do it anymore. Where does that cable goes to?

[TiTAN]

you disconnect the battery before pulling the ECU out, that way there isn't any power running through the system to give sparks.

you may have blown a fuse check them all with a test light/multimeter.

[Red Devil Turbo]

do you know where is the fuse for the ECU

[GTScotT]

check all the fuses on the drivers side kick panel and also the fuse box in the engine bay.

[zebra]

dont forget the IGN fuses in the boot....why oh why did nissan feel the need for 3 bloody fuse boxes!!!